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Dairy Cattle And Reproduction

Subjects : industries, dairy
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Luteolysis happens because of the ____________ hormone






2. (LH) stimulates the Leydig cells to produce testosterone






3. Male on one pin and female on other side






4. Urinary calculi.






5. 147 days






6. When are steers and heifers weaned from bottle feeding?






7. Duct through penis that carries sperm and urine






8. Can survive ~7 days in cow. vast majority <48 hours






9. (LH) stimulates the Leydig cells to produce testosterone






10. Contains and regulates the temp of the testes for sperm production






11. Failure to have both testis (gonads) descend






12. 16-20 hours






13. Pulls sperm and egg together - gets body ready for pregnany - stimulates growth cells - develops mammary glands - starts to deposit fat.






14. (male) pushes the testes upward toward the body for warmth or protection






15. Why does estrus happen before ovulation?






16. The more stressed out the male is - the less sperm he is going to produce






17. Indicator of sperm production. the bigger the scrotal circumference the bigger volume of sperm because more seminal vesicles available to produce the sperm






18. 4-6 days






19. When she is pregnant in her last trimester because she needs the energy to carry around and deliver the calf. and when the calf is born because the cow needs the fat to be deposit it into her milk for the calf's energy stores.






20. Constitute 50-90% of the volume of the ejaculate. (3 glands total: seminal vesicles - prostate gland - cowper's gland)






21. Prevent the cow from getting an infection from the calve






22. 1. reproduction - 2. mastitis/udder problems - 3. low milk production - 4. soundness/poor feet and legs (living on concrete)






23. Serves as a bone cradle for the reproductive system. used greatly in palpation as a 'landmark'.






24. 336 days






25. S-shaped inside body - relaxes to be exposed for breeding. Disadvantges: muscles weaken with age - cannot always hold it in - exposed to harsh outside conditions or stepped on.

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26. ~305 days (altough often longer due to breeding difficulties)






27. Look for infection - split - and rupture of the penis






28. 19-23 (21) days






29. Front feet and head first. (except for hogs and dogs)






30. (FSH) helps to regulate puberty - needed every day - stimulates the sertoli cells to produce nutrients for the sperm






31. Hold the penis in the bulls body when not in use. releases penis before ejaculation or urination.






32. (male) definition: duct located outside of the testes. 3 parts: head - body - tail. 4 Functions:concentrate sperm - store sperm - transport sperm - site of sperm maturation. entire process takes ~40-60 days






33. Way to know everything is alright with the breeding male






34. 19-23 (21) days






35. Check feet and legs - look for masculine traits in build such as crest and muscling






36. Head - neck - mid-piece - tail. genetic material - has an enzyme covering that allows it to penetrate the egg






37. Can produce 200 calves naturally (~100 bulls) - top 1-2% will grade like him. everything left to chance if no AI performed






38. ~60 days before calving






39. Cleans and lubricates the urethra ahead of the sperm. (if not - the urine in the urethra has a high salt content and would cause sperm to rupture and die)






40. What about the sperm for a bull which has been castrated but still has testicles?






41. Help to signal hormone levels which we need both in the brain right next to each other.






42. Produce testosterone. located between the seminiferous tubules






43. Indicator of sperm production. the bigger the scrotal circumference the bigger volume of sperm because more seminal vesicles available to produce the sperm






44. (LH) causes female's egg to break (her period)






45. Milk ~305 days - dry 60 days prior to calving






46. 16-20 hours






47. 1. bring in new genes - 2. replace males with leg problems (difficulty breeding) Note: culling has a much greater emphasis in the dairy industry vs the beef industry.






48. When are steers and heifers weaned from bottle feeding?






49. 1. visual evaluation - 2. scrotal circumference - 3. penis and prepuce observation - 4. rectal palpation - 5. libido test - 6. semen evaluation






50. Not under a timeline - cow can not be sold as steak